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Available-for-Sale Securities, at Fair Value (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Securities, Available-for-Sale [Abstract]  
Debt Securities, Available-for-sale The following table presents the Company’s AFS investment securities by collateral type as of March 31, 2023 and December 31, 2022:
(in thousands)March 31,
2023		December 31,
2022
Agency:
Federal National Mortgage Association$4,968,798 $4,112,556 
Federal Home Loan Mortgage Corporation3,615,921 3,332,314 
Government National Mortgage Association75,975 208,706 
Other172,846 — 
Non-Agency127,280 125,158 
Total available-for-sale securities$8,960,820 $7,778,734 
Schedule of Available-for-sale Securities Reconciliation
The following tables present the amortized cost and carrying value of AFS securities by collateral type as of March 31, 2023 and December 31, 2022:
March 31, 2023
(in thousands)Principal/ Current FaceUn-amortized PremiumAccretable Purchase DiscountAmortized CostAllowance for Credit LossesUnrealized GainUnrealized LossCarrying Value
Agency:
Principal and interest
$8,848,397 $189,182 $(84,550)$8,953,029 $— $32,146 $(185,516)$8,799,659 
Interest-only875,510 42,232 — 42,232 (5,274)1,579 (4,656)33,881 
Total Agency9,723,907 231,414 (84,550)8,995,261 (5,274)33,725 (190,172)8,833,540 
Non-Agency
1,242,893 8,070 (326)131,088 (648)523 (3,683)127,280 
Total$10,966,800 $239,484 $(84,876)$9,126,349 $(5,922)$34,248 $(193,855)$8,960,820 
December 31, 2022
(in thousands)Principal/ Current FaceUn-amortized PremiumAccretable Purchase DiscountAmortized CostAllowance for Credit LossesUnrealized GainUnrealized LossCarrying Value
Agency:
Principal and interest
$7,781,277 $189,246 $(33,413)$7,937,110 $— $6,310 $(325,960)$7,617,460 
Interest-only963,866 45,882 — 45,882 (6,785)1,890 (4,871)36,116 
Total Agency8,745,143 235,128 (33,413)7,982,992 (6,785)8,200 (330,831)7,653,576 
Non-Agency
1,263,789 8,511 (225)131,635 (173)545 (6,849)125,158 
Total$10,008,932 $243,639 $(33,638)$8,114,627 $(6,958)$8,745 $(337,680)$7,778,734 
Debt Securities, Available-for-sale, Weighted Average Life Classifications
The following table presents the Company’s AFS securities according to their estimated weighted average life classifications as of March 31, 2023:
March 31, 2023
(in thousands) Agency Non-Agency Total
< 1 year$1,078 $— $1,078 
≥ 1 and < 3 years22,974 — 22,974 
≥ 3 and < 5 years386,697 119,157 505,854 
≥ 5 and < 10 years8,004,076 4,262 8,008,338 
≥ 10 years418,715 3,861 422,576 
Total$8,833,540 $127,280 $8,960,820 
Debt Securities, Available-for-sale, Allowance for Credit Losses The following table presents the changes for the three months ended March 31, 2023 and 2022 in the allowance for credit losses on Agency and non-Agency AFS securities:
Three Months EndedThree Months Ended
March 31, 2023March 31, 2022
(in thousands)AgencyNon-AgencyTotalAgencyNon-AgencyTotal
Allowance for credit losses at beginning of period
$(6,785)$(173)$(6,958)$(12,851)$(1,387)$(14,238)
Additions on securities for which credit losses were not previously recorded
— (318)(318)(2)— (2)
(Increase) decrease on securities with previously recorded credit losses
827 (367)460 (2,493)1,381 (1,112)
Write-offs
684 210 894 3,779 — 3,779 
Allowance for credit losses at end of period
$(5,274)$(648)$(5,922)$(11,567)$(6)$(11,573)
Debt Securities, Available-for-sale, in Unrealized Loss Positions
The following tables present the components comprising the carrying value of AFS securities for which an allowance for credit losses has not been recorded by length of time that the securities had an unrealized loss position as of March 31, 2023 and December 31, 2022. At March 31, 2023 and December 31, 2022, the Company held 646 and 704 AFS securities, respectively; of the securities for which an allowance for credit losses has not been recorded, 431 and 553 were in an unrealized loss position for less than twelve consecutive months. At both March 31, 2023 and December 31, 2022, none of the Company’s AFS securities were in an unrealized loss position for more than twelve months without an allowance for credit losses recorded.
March 31, 2023
Unrealized Loss Position for
Less than 12 Months12 Months or MoreTotal
(in thousands)Estimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized Losses
Agency$6,206,214 $(187,843)$— $— $6,206,214 $(187,843)
Non-Agency119,252 (3,294)— — 119,252 (3,294)
Total$6,325,466 $(191,137)$— $— $6,325,466 $(191,137)
December 31, 2022
Unrealized Loss Position for
Less than 12 Months12 Months or MoreTotal
(in thousands)Estimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized LossesEstimated Fair ValueGross Unrealized Losses
Agency$7,168,694 $(328,258)$— $— $7,168,694 $(328,258)
Non-Agency117,816 (5,933)— — 117,816 (5,933)
Total$7,286,510 $(334,191)$— $— $7,286,510 $(334,191)
Schedule of Realized Gain (Loss) on Sales of Debt Securities, Available-for-sale The following table presents details around sales of AFS securities during the three months ended March 31, 2023 and 2022:
Three Months Ended
March 31,
(in thousands)20232022
Proceeds from sales of available-for-sale securities$1,360,742 $2,012,620 
Amortized cost of available-for-sale securities sold(1,393,484)(2,067,471)
Total realized losses on sales, net$(32,742)$(54,851)
Gross realized gains$14,070 $14,695 
Gross realized losses(46,812)(69,546)
Total realized losses on sales, net$(32,742)$(54,851)